The boyfriend line is indeed a mayor shit test or indicator of no interest. In my experience, how longer she waits to bring it up, the higher the probability it's a shit test. If she sais she had a boyfriend after 2 sentences, you're usually done for (except if she is really hot and gets approached by a lot of guys and has a high natural shield).
If you are looking for real girlfriend material in that age categorie your best bet are girls who are just out of a long relationship.
If you are looking for real girlfriend material in that age categorie your best bet are girls who are just out of a long relationship.